<%#提示信息板%>
<% if flash[:success] %>
    <div class="alert alert-success"><%= flash[:success] %></div>
<% elsif flash[:info] %>
    <div class="alert alert-info"><%= flash[:info] %></div>
<% elsif flash[:warning] %>
    <div class="alert alert-warning"><%= flash[:warning] %></div>
<% elsif flash[:danger] %>
    <div class="alert alert-danger"><%= flash[:danger] %></div>
<% end %>